/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug     7194254

 * @summary Creates several threads with different java priorities and checks

 *      whether jstack reports correct priorities for them.

 *

 * @library /testlibrary

 * @run main ThreadPriorities

 */

import java.util.ArrayList;

import java.util.concurrent.CyclicBarrier;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import com.oracle.java.testlibrary.*;

import static com.oracle.java.testlibrary.Asserts.*;

public class ThreadPriorities {

    public static void main(String[] args) throws Throwable {

        final int NUMBER_OF_JAVA_PRIORITIES =

                Thread.MAX_PRIORITY - Thread.MIN_PRIORITY + 1;

        final CyclicBarrier barrier =

                new CyclicBarrier(NUMBER_OF_JAVA_PRIORITIES + 1);

        for (int p = Thread.MIN_PRIORITY; p <= Thread.MAX_PRIORITY; ++p) {

            final int priority = p;

            new Thread("Priority=" + p) {

                {

                    setPriority(priority);

                }

                public void run() {

                    try {

                        barrier.await(); // 1st

                        barrier.await(); // 2nd

                    } catch (Exception exc) {

                        // ignore

                    }

                }

            }.start();

        }

        barrier.await(); // 1st

        int matches = 0;

        ArrayList<String> failed = new ArrayList<>();

        ProcessBuilder pb = new ProcessBuilder(

                JDKToolFinder.getJDKTool("jstack"),

                String.valueOf(ProcessTools.getProcessId()));

        String[] output = new OutputAnalyzer(pb.start()).getOutput().split("\\n+");

        Pattern pattern = Pattern.compile(

                "\\\"Priority=(\\d+)\\\".* prio=(\\d+).*");

        for (String line : output) {

            Matcher matcher = pattern.matcher(line);

            if (matcher.matches()) {

                matches += 1;

                String expected = matcher.group(1);

                String actual = matcher.group(2);

                if (!expected.equals(actual)) {

                    failed.add(line);

                }

            }

        }

        barrier.await(); // 2nd

        barrier.reset();

        assertEquals(matches, NUMBER_OF_JAVA_PRIORITIES);

        assertTrue(failed.isEmpty(), failed.size() + ":" + failed);

    }

}